Cornelis j



c. 1. EssELlNG.. DRILL.

APPLICATION FILED NOV. 8.1915.

Patented June 10, 1919.

f. 1./4 I r S Irv/Qn AVIormZy CORNELIS J. ESSELING, 0F HEERLEN,NETHERLANDS.

DRILL.

Specification of Letters Patent.

Patented June 10, 1919.

Application filed November 8, 1915. Serial N o. 60,376.

To all whom z't may concern:

Beit known that I, CORNELIS JASPER EssnLING, residing at Heerlen, theNetherlands, a subject of the Queen of the Netherwill drill a hole of alarger diameter thank the external diameter of the tube through whichthe drill is lowered. By drilling a hole of a larger diameter than thediameterof the bore tube, the tube may be lowered in accordance with theadvancement of the drill. By closely following the drill head with thetubing thefalling of fragments of rock out of the sides of the bore holeinto the latter is prevented, as the sides of the hole will be coveredby the bore tube. The latter advantage is of great importance especiallyin boring holes in crumbling and fissured rock.

In drilling according to this method much less tubing of the bore holeis required. Proportionally much deeper holes may be drilled as owing tothe smaller number of tubing sections to be inserted into the bore holethe diameter of the latter decreases less quickly.

The main object of my invention is obtained, by slidably mounting theindividual cutting members of the drill upon their spindles.

Another object of my invention is to provide a roller drill which willdrill holes of dilierent diameters. This object is preferably obtainedby inserting spacing members between the drill head and the individualcutting members. IIhese spacing members may be of varying thickness, soas to vary the distances over which the cutting members may slideoutwardly on their spindles.

A further object of my invention is to provide drill of the above typewith a separate cutting tool for cutting awayV the core, which may beleft between the ordinary cutting members. Preferably this separatecutting tool is mounted on a spindle arranged eccentrically with regardto the axis of the drill.

Other features of invention will be hereinafter pointed out.

My invention is illustrated on the accompanying drawing, in which:

Figure 1 is a vertical sectional view of a drill in which severalfeatures of my invention are embodied, the drill being shown wlile it isbeing lowered through the bore tu e.

Fig. 2 shows the position-of the cutting members with regard to thedrill head during the drilling operation.

Fig. 3 shows a drill according to lmy invention in its application as acore drill.

Fig. 4 shows the drill in its application as a roller drill.

On the drill head1 the spindles 3 are in the usual manner arranged insuch a way that they form an. angle with each other and also with thelongitudinal axis of the drill. The hardened steel cutting members orrollers 2 are rotatably mounted on the spindles 3. In the constructionshown in Figs. 1, 2 and 4 the drill head 1 is further provided with aspindle 4 placed eccentrically with regard -to tlieaxis of the drillhead. On this spindle a bronze supporting cone 5 is screwed aroundwhich' cone a hardened steel cutting roller 6 is rotatably mounted.

According to my invention the rollers 2 are longitudinally slidable onthe spindles 3. hen the drill is lowered through the bore hole therollers by their weight assume the position shows in Fig. 1. However, assoon as they touch the bottom of the bore hole the rollers will by thepressure exerted by the weight of the drill rods resting upon them slideapart and assume the position illustrated in Fig. 2.

If the drill head is now rotated in the usual'manner. then the cuttingmembers 2 drill a hole with a diameter 7 (Fig. 2) which is greater thanthe outer diameter 8 of the drill shoe 'attached to the lowest partofthe bore tubes 10. 1 i

In the drill illustrated by Figs. 1, 2 and 4 the material left as a corebetween the cutting members 2 is cut away by the steel roller 6.

In Fig. 3 the drill head 1 is provided with a central bore 11 throughwhich the core remaining between the cutting members 2 prsses. The drillhead is further provided with a core catching sleeve `12 with corelifter 13 upon which sleeve the core barrel 14 is mounted. The corecatching sleeve and core litter serve in the known manner for grippingand breaking olf the core and raising it to the surface, the core barrelthen receiving the core.

It the drill head is only to work as a roller drill and not as a coredrill then according to my invention spacing members or rings l5 areplaced between the drill head l and the cutting members In this manner ahole may be drilled having a diameter smaller than the inner diameter ofthe bore tube l0, while by employing spacing rings oic ditl'erentVthickness the diameter of the .hole to be drilled and the thickness ot'the core to be obtained may further be cont-rolled.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is l. In combination, a drill head havingopposing spindles inclined toward each other and extending toward thelongitudinal axis of the head, and cutting members mounted on saidspindles or free axial movement and in inoperative position having theirouter ends spaced away from the outer ends of the spindles, whereby inoperation said cutting members can slide outwardly on said spindles andengage the walls of the drill head adjacent the outer ends of thespindles for cutting a hole of larger diameter than the drill head.

2. In combination, a drill head having opposing spindles inclined towardeach other and extending toward the longitudinal aXis of the head, andcutting members mounted on said spindles for free axial movement and ininoperative position resting entirelyT within the boundary of theinterior of the tubing through which the drill head is inserted andhaving their outer ends spaced away from the -walls supporting the outerends of the spindles, whereby in operation said cutting members canslide outwardly on said spindles and engage the walls of the drill headadjacent the outer ends of the spindles for cutting a hole of largerdiameter than the drill head.

3. In combination, a drill head having opposing spindles inclined towardeach other and extending toward the longitudinal axis of the head, andtrusto-conica-l shaped cutting members mounted on said spindles for freeaxial movement and in inoperative position resting entirely within theboundary of the interior of the tubing through which the drill head isinserted and having their outer ends spaced away from the outer ends ofthe spindles, whereby in operation said cutting members can slideoutwardly on said spindles.

el. ln combination, a drill head having opposing spindles inclinedtoward each other and extending toward the longitudinal axis of saiddrill head, cutting members iree to slide on said spindles andcoperatmodera ing with each other to drill an annular hole ot greaterdiameter than the outer diameter of the tube through which they arelowered, and means for removing the core left between said cuttingmembers.

5. ln combination, a drill head having opposing spindles inclined towardeach other and extending toward the longitudinal axis of the head,cutting members mounted on said spindles for free axial movement and ininoperative position having their outer ends spaced away from the outerends of the spindles, whereby in operation said cutting members canslide outwardly on said spindles, and means for limiting the outwardsliding movement of the cutting members.

6. ln combination, a drill head having opposing spindles inclined towardeach other and extending toward the longitudinal aXis of said drillhead, cutting members free to slide on said spindles, and means fordetermining the amount of the sliding movement of the cutting membersaway from each other.

7. ln combination, a drill head having opposing yspindles inclinedtoward each other, cutting members free to slide on said spindles andcooperating with each other to drill an annular hole of greater diameterthan the outer diameter of the tube through which they are lowered, andmeans for determining the amount 'of the sliding movement of the cuttingmembers away from each other.

8. ln combination, a drill head having opposing spindles inclined towardeach other= and extending toward the longitudinal axis of the head,cutting members mounted on said spindles for '.ree axial movement and ininoperative position having their outer ends spa-ced away from the outerends of the spindles, whereby in operation said cutting members oanslide outwardly on said spindles, and washers arranged on the spindlesfor limiting the outward sliding movements of the cutting members.

9. ln combination, a drill head having opposing spindles inclined towardeach other and cutting members tree to slide on said spindles, saidcutting members being hollowed out to lit over said opposing spindles,and the length of said spindles being such that the cutting members whenfarthest removed rom the drill head are mutually held in positionagainst falling ed said spindles, said drill head being provided withmeans for removing the core lett hetween said cutting members.

l0. A drill, comprising f l dies projecting lom said t posed at an a tothe lo the drill, tru nical sh ers ...longitudine and coperating witheach other to drill an annular hole when the drill head is rotated,spacing rings placed between the drill head and said frusto-conicalshaped cutting roll,

other, cutting members free to slide' on said spindles, and means forremoving the central core left by said cutting members.

In testimon whereof I aix my signature in presence o two witnesses.

CORNELIS J. ESSELING.

Witnesses:

I-I. J. Kooy, A. C. NELSON.

